Speed Dial entries disapearing

I have a recurring problem where my speed dial entries disapear. I haven't been able to identify a pattern. Oddly, it's not all of them. The numbers I call the most seem to be the ones that disappear. I bought my DNA from Verizon on November 30th. Had to have it replaced on December 18th because the headphone jack quit working and this one also has the same issue with the Speed Dial entries disapearing. Anyone else having this issue?

It happened to me after merging a bunch of contacts from Gmail to Exchange. But not since.

Yes. This is happening to me as well. It is random, and quite odd. As you say, it is not all the numbers. Lately it has been just 1 of 9. So odd...